Every Time Zone - Online tool for keeping up with times around the world.
Timezone.io - Keep track where and when your team is.
Circa - Find a time that works for everyone, in every time zone
HomeSlice - Mobile App Roommate Dashboard (chores, expenses, etc.)
Time Zone Pro - A beautiful world clock for friends, family, clients and more
World Clock iOS 8 Widget - Check the time, anytime. Just pull down Notification Center.